My favorite blogreader is BlogBridge. I bit the bullet and bought the USD 5,–/3 month license for a unlimited number of feeds and am very happy with it. In their forum, they react to bug reports and questions in a timely manner and they even fixed „my” problem with the Vista UAC prompt.

One of the features, why I always recommend BlogBridge as a rss-reader, is the tagging-feature. If you have a del.ico.us account, just enter it in the settings and BlogBridge will retrieve your tags from del.icio.us and offer them, if you press „t” in an article. If you tag an article in BlogBridge and you entered your del.icio.us credentials, the tagged article will show up in your del.icio.us list. Fabulous!